ESXi 5.x uses a new log infrastructure. If your host is deployed with Auto Deploy, or if you set up a log directory separate from the default location in a scratch directory on the VMFS volume, you might need to change your current log size and rotation settings to ensure that enough space for system logging exists.

The VMware vCenter Server system must be able to send data to every managed host and receive data from every vSphere Web Client. To enable migration and provisioning activities between managed hosts, the source and destination hosts must be able to receive data from each other.

The VMware vCenter Server system must be able to send data to every managed host and receive data from every vSphere Web Client. For migration and provisioning activities between managed hosts, the source and destination hosts must be able to receive data from each other.

vCenter Server and Microsoft Internet Information Service (IIS) both use port 80 as the default port for direct HTTP connections. This conflict can cause vCenter Server to fail to restart after the installation of vSphere Authentication Proxy.